<h1>模板里绑定数据</h1>
<p>{{msg}}</p>
<h1>绑定属性</h1>
<div [title]="msg">张三</div>
<div [innerHTML]="content"></div>
<h2>{{1+2}}</h2>

<ol>
  <li *ngFor="let item of arr">{{item}}</li>
</ol>
